Dell Dimension DMC Owner's Manual page 41

Light Pattern Problem Description
A possible video card failure has
occurred.
A B C D
A possible floppy or hard drive failure
has occurred.
A B C D
A possible USB failure has occurred.
A B C D
No memory modules are detected.
A B C D
= yellow
= green
= off
Suggested Resolution
• If the computer has a video card,
remove the card and reinstall it
(see page 62), and restart the
computer.
• If the problem still exists, install
a video card that you know works
and restart the computer.
• If the problem persists or the
computer has integrated video,
contact Dell (see page 90).
Reseat all power and data cables
and restart the computer.
Reinstall all USB devices, check
cable connections, and then restart
the computer.
• Reinstall all memory modules
(see page 75) and restart the
computer.
• To eliminate the possibility of a
faulty memory connector, remove
all memory modules (see
page 75), reinstall one memory
module (if the computer
supports a single module), and
then restart the computer. If the
computer starts normally, move
the memory module to a
different connector and restart
the computer. Continue until
you have identified a faulty
connector or reinstalled all
modules without error.
Advanced Troubleshooting
41